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Meadowlark Optics - Wave Plates 6/24 LB 2024
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Research & Technology News

Feedback Stabilizes High-Power Diode Lasers
Sep 1, 2003 — High-power, broad-area semiconductor lasers exhibit spatial and temporal instabilities due to fundamental nonlinear interactions between the intense optical field and the semiconductor material. These interactions result in a broad spectral emission and a double-lobed far-field intensity profile that impede the usefulness of the devices for spectroscopy, materials processing, medicine and other applications. A group at Darmstadt University of Technology in Germany has produced streak-camera...
Fresnel Optics Investigated for Next-Generation Lithography
Sep 1, 2003 — Achromatic Fresnel optical sys-tems under development at Xradia Inc. of Concord, Calif., promise to compete with mirror-based solutions for next-generation extreme-ultraviolet lithography in the production of integrated circuits. The researchers at...
Heat Spreader Boosts Laser Power
Sep 1, 2003 — Optically pumped vertical-external-cavity surface-emitting lasers are attractive in a number of applications but have suffered from thermal loading because the pump beam is focused to such a small spot -- typically 100 µm -- in the lasers' gain...
High-Power Yb-Doped Fiber Laser Emits at 977 nm
Sep 1, 2003 — Engineers at the University of Southampton and at Southampton Photonics Inc. in the UK have demonstrated the first high-power -- i.e., greater than 1 W -- ytterbium-doped fiber laser emitting at 977 nm. Such a device might find use as a pump for...
Investigations Probe Ultraslow and Superluminal Light
Sep 1, 2003 — In the few short years following the demonstrations of the slowing and stopping of light in ultracold clouds of atoms and of the superluminal propagation of radiation, researchers have entered a golden age of exploration into such phenomena. Two...
Laser Links Depend on the Weather
Sep 1, 2003 — Researchers at Ben-Gurion University of the Negev in Beersheba, Israel, have performed a mathematical analysis of the wavelength-dependence of atmospheric interference on free-space optical links. Their results will affect the wavelength of...
Noncritical Phase Matching Yields 236-nm Radiation
Sep 1, 2003 — Investigators at Aculight Corp. in Bothell, Wash., have employed noncritical phase matching to obtain 236-nm radiation by twice frequency-doubling a Q-switched, 946-nm Nd:YAG laser. They generated 43 mW of average ultraviolet power inside a cesium...
System Measures Raman Gain in Bulk Glasses
Sep 1, 2003 — Scientists from the University of Central Florida in Orlando have developed an optical system to measure stimulated Raman gain coefficients in bulk glasses. They have used it to investigate two tellurite glasses developed at the Centre National de...
Twin-Detector Receiver Detects Single Photons over 100 km
Sep 1, 2003 — A low-noise receiver developed by a team of scientists at NEC Corp. and Japan Science and Technology Corp., in collaboration with the Telecommunications Advancement Organization of Japan, has enabled the transmission of single 1550-nm photons over...
Wavelength Converter Features Three-Wave Mixing Inside a Pump Laser
Sep 1, 2003 — A research group at McMaster University in Hamilton, Ontario, Canada, has proposed and demonstrated an intracavity approach to wavelength conversion for optical telecommunications networks that eliminates the need for high-power, tunable pump...
All-Fiber, Q-Switched Laser Generates 1.8 mW
Aug 1, 2003 — A team of scientists at the University of Science and Technology of China in Hefei has designed and demonstrated an all-fiber, Q-switched laser. High-power, single-frequency oscillation is obtained with a ring resonator, which eliminates the...
Co-Doping Drives 2-µm Fiber Laser
Aug 1, 2003 — A group of scientists at the University of Sydney in Australia has demonstrated the use of ytterbium as a sensitizer in a holmium-doped fiber laser. Although Yb3+-Ho3+ sensitizing-lasing systems have been explored in crystalline YAG hosts, the...
External Cavity Controls Transverse Mode in VCSEL
Aug 1, 2003 — The fundamental transverse mode of a vertical-cavity surface-emitting laser (VCSEL) produces a high-quality Gaussian beam, as it does with any laser. As the bias current of the device is increased, however, higher-order transverse modes often begin...
Femtosecond Pulses Write Fiber Bragg Gratings
Aug 1, 2003 — A group at the Communications Research Centre Canada in Ottawa has presented an alternative means of writing fiber Bragg gratings that uses femtosecond pulses of 800-nm radiation from a Ti:sapphire laser. The advantage of such an approach, according...
In Search of the Dipole Moment
Aug 1, 2003 — Turning quantum dots on and off sounds as simple as flipping a switch, but it can't be accomplished until we understand how much excitation is required to complete the task. There has been a lot of confusion in the literature, according to Kevin L....
Lasers and Chemical Etch Make Tiny Holes in Glas
Aug 1, 2003 — Scientists at the Natural Research and National Research councils, both in Ottawa, have shown that femtosecond laser pulses, together with a chemical etching process, can be used to fabricate periodic microstructures in glass. They think that the...
Microlaser-Pumped Optical Parametric Generator Is Small, Tunable IR Source
Aug 1, 2003 — Just as a high-gain laser can function in a superradiant mode -- i.e., without a resonator -- a high-gain optical parametric oscillator can forgo its resonator and still operate effectively. In such a case, the device is called an optical parametric...
Optical Switch Uses Thin Film and Mirror
Aug 1, 2003 — Sarun Sumriddetchkajorn and Khunat Chaitavon of Thailand's National Science and Technology Development Agency and Ministry of Science and Technology, both in Pathumthani, have developed a novel concept for a 2 x 2 optical switch. The device...
Origin of 'Fiber Fuse' Is Revealed
Aug 1, 2003 — In the argot of fiber optics engineers, a "fiber fuse" occurs when a fiber, overloaded with optical power, fails catastrophically. Several mechanisms have been suggested to explain the phenomenon, but now a team from OFS Research Laboratories in...
Photonic Crystal Device Demonstrates Design Rules
Aug 1, 2003 — Although research laboratories around the world have studied photonic crystals intensively, few efficient photonic devices have been built from the structures. Scientists at Kyoto University in Japan report that this is due largely to a lack of...
Q-Switched Ho:YAG Laser Produces 50-mJ Pulses
Aug 1, 2003 — Eye-safe pulsed lasers operating in the 2-µm spectral region are useful in ranging, remote sensing and laser radar applications. Moreover, if they have high peak powers, their outputs can be efficiently converted in optical parametric oscillators...
Researchers Demonstrate Mode-Locked Fiber Laser
Aug 1, 2003 — A fiber laser capable of producing a train of picosecond, wavelength-tunable pulses at gigahertz frequencies would be a useful source for wavelength division multiplexing telecommunications and could find application in fiber-sensor systems and...
Terahertz Probes Reveal Excitonic Enhancement
Aug 1, 2003 — While terahertz technology hovers between the fields of high-frequency electronics and photonics, researchers from Lawrence Berkeley National Laboratory in Berkeley, Calif., recently pushed its limits to study transient conducting and insulating...
Compensating Thermal Effects in Rod Lasers
Jul 1, 2003 — By forcing an Nd:YAG laser to operate in radial or azimuthal polarization, a team at Soreq Nuclear Research Center in Yavne, Israel, has overcome the thermally induced beam-quality aberrations commonly associated with solid-state rod lasers. The...
Digital Holography Used in Watermarking 3-D Object
Jul 1, 2003 — In this age of tightened security, researchers at the University of Connecticut in Storrs have discovered what may someday prove to be a useful method of hiding one piece of information inside another. Using a watermarking method, a 3-D object is...

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